Holding and turning apparatus



F. A. LlTTE-R HOLDING AND TURNING APPARATUS June 19, 1928.

Filed Aug. 50. 19,26

Heder/'ck fil/ef -IN VEN TOR.

ATTORNEY Patented .lune 19, i928.

rare

:r1-*Ica f l HOLDIG AND TURNING APIPARATUS. .I

` application med Agust 3o, 1926. serial No. 132,643. I

My'invention relates to holding and turning apparatus and has to do particularly with the provision of a compact and portable power driven unit for holding and rotating a tool or piece of work removably held and centered within a novel `adjustable chuck which is operatively connected through a reduction gearing to an electric motor mounted upon a common 'base with the other parts of the apparatus.

rlhe primary object of my invention is the provision of a holding and turning apparatus embodying in one compact unit an electric motor, a reduction gearing Vand a chuck which is adjustable to center and hold pieces of work or tool shanks of dtl'erent diameters.

This invention is particularly adapted'to operations such, for example, as drilling, reaming, boring or the likewhich require too much power to be successfully completed by a device that is entirely operated by hand and yet are tate both the work and the tool being set up in a holding device. l

.A further object of my invention is the provision of a 'chuck consisting of a driven head member, tapered jaws coacting with inclined seatsin said head member and a longitudinally reciprocable means connectedv to said jaws for `adjusting the size of the receiving opening formed by Vsaid jaws.

Other objects of my invention will appear from the following detailed description and all features are illustrated in the accompanying drawing wherein the figure is a perspective view having parts broken away and parts in section to show the general arrangement of the various parts of my invention and in particular the driving mechanism and adjustable chuck.

In the drawings, an illustrative embodiment of my invention is shown as comprising a base structure 1 having an electric motor 2 removably attached to one end thereof by means of bolts 3. The base 1 preferably forms a lubricant container for the reduction gearing hereafter described. rlhe opposite end of the base structure 1 forms a gear casing 4 for containing the bearings and gearing through which the electric motor 2 operates the chuck 5 in a manner to be presently described. y

The driving mechanism for the chuck 5 preferably comprises a shaft 6 which is provided with aworm pinion 7. The shaft 6 too small and simple to necessi-l ving 25 interposed between the head may be vjournaled in suitable bearings 8 and 9 in opposite ends of a housing 10 forming a preferably removable'part oft-he gear case 4. The shaft 6 is also preferably provided with athrust bearing 11 and is connected to the shaft 12 of motor 2 by means of a coupling 13. Thecoupling 13 may comprise al flexibley tube member 14 secured between the adjacent ends of the motor shaft 12 and the shaft 6 by bolts or the like 15 that extend through suitable openings in thetube 14 and shaft ends andl bind against the oppositely arranged washers 16. Extending transversely of the gea-r case 4 and base structure 1 and journaled in suitable bearings 17 and 18 is a tubular shaft 19y which is'preferably formed with a relatively largehead 20. Secured to the shaft19 by means of a key 21 and nut 22 cooperating with threads on the shaft 19 is a worm gear 23 which meshes with the worm pinion 7 carried by the-shaft 6. The keyl 21, also, serves to secure in place a thrust plate 24 which together with a bear- 20 and the bearing 17 prevents lengthwise movement of the shaft 19. v

The enlarged head 2O of the shaft 19 may be formed with a plurality of preferably L-shaped slots or recesses 26 which have inclined inner faces 27 for a purpose to be later explained. Mounted Within the shaft 19 and longitudinally reciprocable with vreference thereto is a shaft 28. LThisshaft 28 lnay be formed with a somewhat larger socket portion 29 which fits within the similarly enlarged portion 30 ofthe shaft 19. If desired the shaft y 28 may be made hollow throughout its length. The socket port-ionv A29 of the shaft 28 is provided with a plurality of slots 31 which are adapted to receive the chuck jaw members 32. These members are preferably L-shaped in crosssection and are designed to t within the similarly shaped slots or recesses 26 formed in the head 20. The jaw members 32 are also formed with inclined back faces 33 which have a bearing on the inner inclined faces 27 of the recesses 26.

rlhe jaw members 32 of the chuck 5 may be moved toward or from the cent-ral axis of the socket 29 by suitably moving the shaft 28 lengthwise of the .shaft 19 by means of 4a hand wheel 34 which has a boss portion 35 vadapted to bear against the end 36 of the shaft 19 which projects slightly beyond ,theV

bearing 18. ThisV arrangementprevents Having thus described my invent-ion, vvhat binding and insures an easy adjusta ility of I claim is:

the jaw members 32. It will be obvious that any longitudinal movement of the shaft 28 Will be effective to causefthe inclined Lfaces of the jaw members 32 to coact With the inclined faces 2T of the recessesEZ andso move such jaw members radially as may be necessary to adjust the chuck for receiving a particular sized tool shank4 or piece kof Work. When such piece of Work or tool shank, as for instance the .shank ofa reamer, has been positionedvvvithin the socket portion V29 of the .shaft 28, thevhand Wheel 34 may be revolved in the proper direction to center it and cause the jaw members 32 to tightly grip" and hold it While being turned by the motor. 4 y

y From the preceding description, it Will be apparent .that I have provided a compact and particularly simple holding and turningvapparatus which can be cheaply manufactured and which is adapted to effec-tively perform its intended functions. AIt will furthermore, be apparent that I have produced an extremely simple, ,yet compact andpositive chuck, which is adapted to securely hold pieces of work or tool shanks of a-Wide range of sizes.

Also, by referring to the preceding description, it will be seen that I have provided adevice Which-is capable of a Wide range of varying uses. y For instance, a tool might be held vand rotated in myidevice andthe work held in proper position `by hand, the Work might .be held-and rotated in my device and thetool held by hand, or the Work might be held and-rotated in my device to facilitate grinding orpolishing of the pieces of -W rk.

l. A holding and turning Vapparatus comprising a base, a motor mounted upon said basea Worm -pinionconnected to saidV motor,

a shaft having an enlarged portion at one --end thereof andintegrally formed therewith',

a Worm gear secured to the end of said shaft most remote vfrom the enlarged portion of said shaft and intermeshed With Said pinion, a second shaft having an enlargedportion at one end thereof and integrally formed therewith disposed Within said first named shaft, and means forV moving said second named shaft longitudinally relative to said'first named shaft, the enlarged portion of the second named shaft forming a receiving opening yfor the Work.

2. A holding and turning appara'tuscomprising a Vbase, a motor mounted upon said base,`a tor, a transverse shaft having an enlarged portion at one end thereof, and integrally formed therewith, a Worm gear secured to the end of said shaft most remote from the enlarged portion of the said shaft and intermeshed with said pinion, a secondnamed shaft'having an enlarged portion at one end thereof and integrally'formed therewith disposed Within said first named shaft, means for moving said .second named shaft longitudinally relative to said iirst named shaft,

the enlarged portion of the second named shaft forming a receiving'opening for the vvorkor tool, and means forjprevventing longitudinal movement of' said first named shaft.

In testimony whereof I hereby aiiiX my signature. t

FREDERICK A. LITTER Worm pinion connected to said mo-V 

